在网上查找删除重复数据保留id最小的数据，方法如下：
DELETE FROM people WHERE peopleName IN ( SELECT peopleName FROM people GROUP BY peopleName HAVING count(peopleName) > 1 ) AND peopleId NOT IN ( SELECT min(peopleId) FROM people GROUP BY peopleName HAVING count(peopleName) > 1 )
自己使用的时候显示报错：
1 delete from tb where id in (SELECT max(id) from tb GROUP BY user HAVING count(user)>1)
[Err] 1093 – You can’t specify target table ‘XXX’ for update in FROM clause
暂时不知道是什么原因导致的。
然后想办法分布操作，首先筛选出有重复user的数据，然后用max()选出其中较大的那一行：
SELECT max(id) from tb GROUP BY user HAVING count(user)>1
然后再根据得到的max(id)逐条删除多余的数据
1 delete from tb where id=xx
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